package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {

    //微信服务器端的接口地址
    private static final String WX_LOGIN_URL = "https://api.weixin.qq.com/sns/jscode2session";
    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;
    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        String code = userLoginDTO.getCode();
        String openid = getOpenid(code);
        //判断openid是否为空，如果为空则表示登录失败，抛出业务异常
        if(openid == null){
           throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //判断当前用户是否为新用户，如果是新用户则自动完成注册
        User user = userMapper.getByOpenid(openid);
        if(user == null){
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }
        return user;
    }

   private String getOpenid(String code){
       Map<String,String> map = new HashMap<>();
       map.put("appid",weChatProperties.getAppid());
       map.put("secret",weChatProperties.getSecret());
       map.put("js_code",code);
       map.put("grant_type","authorization_code");
       String result = HttpClientUtil.doGet(WX_LOGIN_URL, map);
       JSONObject jsonObject = JSON.parseObject(result);  //将json格式的字符串转化为json对象也就是js对象
       //转化为json格式的对象就可以进行类似键值对的操作
       String openid = jsonObject.getString("openid");
       return openid;
   }
}
